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53 page downloadable PDF book containing 336 Hadoku puzzles in very easy to very hard difficulty levels.
Hadoku puzzles are like Irregular Sudoku - with a twist. A small change of the rules creates an all new game with puzzles ranging from very easy to extremely challenging even in the smaller grids. Hadoku uses the same rules as Ripple Effect and Hakyuu, but have smaller grids and are more interesting and usually more difficult to solve.